Contact for electrical devices



- Dec. 28 1926.

H. A. SEDGWICK CONTACT FOR ELECTRICAL DEVICES Filed Oct. 25, 1919 INVEN TOR.

A TTORNEY Patented Dec. .28, 1926.

UNETED S'Tih'l'hfi nanny A. snnewroir, or MILWAUKEE, Wisconsin. asst-s nor. TO rein atamaraniirnn MFG. 00., or MILWAUKEE, W sconsin, A searchesron or WISCONSIN.

CONTACT FOB ELE GTRIOAL DEVICES.

Application filed October 25, 1919.

This invention relates to contacts for electrical devices.

An object of this invention is to provide a renewable contact of improved construci tion which may be advantageously employed for rheostats and various other devices.

Another object of the invention is to pro vide a renewable contact having supporting means adapted to be permanently fixed to a slate panel or other device, such means being constructed to insure against displacement or loosening thereof during renewals of the contact part.

Another object is to provide a contact of the aforesaid character wherein the renewappended claims.

In the drawing,

Figure 1 is a view, partly in section, showing the contact mounted upon a" section of a panel;

Fig. 2 is a front elevation of Fig. 1;

Figs. 3 and 4 are detail views of certain elements shown in 1.

The contact illustrated is particularly designed for rheostats and the like and com prises a hexagonal nut 1 having a circular contact face 2, a bolt 3 having a threaded circular head a onto which the nut is threaded, a washer 5 carried by the bolt to serve as a stop for the contact nut and a nut 6 ant washer 7 to secure the bolt to a suitable support, such as panel 8.

The bolt 3 is provided beneath its head with sharp tapered lugs 9 and 10 (Fig. l) and the washer 5 is provided with a central opening 11 and radial slots 12 and 13 to receive the shank and projections of said bolt, Thus the washer is adapted to fit closely against the head of the bolt to be firmly clamped thereby against the panel while the lugs 9 and 10 which pass through Serial No. 333,339.

and project beyond the washer serve to secure the bolt and washer against relative rotation. Further, the lugs 9 and 10 are adapted to be driven into the panel by tightening of the bolt to secure both the bolt and washer against turning.

The bolt 3 and washer 5 being secured to the base as described, it will be apparent thatthe contact nut may be. removed and replaced without displacing-or loosening the former. Also, it will be apparent that the washer 5 provides an indestructible stop for the contact nut, it being noted that said nut is counterbored to clear the end of the bolt head. Thus a new contact nut is insured a position on the panel identical with that occupied by the old one and if in each instance the nut is set against the washer 5 the plane of the contact surface thereof will. be substantially the same.

Moreover since the washer 5 is locked against turning the contact nut may be readily locked against accidental turning by merely striking up on the washer a. projection 14 (Figs. 1 and 2) to abut a face of the nut. This may be readily accomplished by use of a chisel in a well known manner and while such a projection prevents accidental turning ofthe nut the latter may nevertheless be readily turned by a wrench for re moval when desired.

When a number of such contacts are placed in close proximity as in a rheostat, the contact nuts thereof may be readily removed and replaced with the aid of a soc cot wrench. Vhon the contacts are so employed hexagonal formation of the contact nuts is very desirable but it will of course be understood that the nuts illustrated may assume any other preferred form.

What I claim as new and desire to secure by Letters Patent is:

1. A contact comprising a cap contact nut. a threaded member onto which said nut is threaded, said member having means independent of said nut to secure the same to a support and a member to be interposed be tween said nut and the support to provide a stop against which the former is adapted to be set.

2. A contact comprising a cap contact nut, a threaded member onto which said nut threaded, said member having means inde pendent of said nut to secure the same to a support, a member carried by the former member to provide a sto against which said contact nut is adaptet to be set, said members having means to secure the same against turning when secured to a support.

3. A contact comprising a bolt for attachment to a support, said bolt having a threaded head, a washer carried by said bolt to be clamped by said head against the support and a contact nut to be threaded onto the head of said bolt and set against said washer.

4-. A contact comprising a bolt to be secured to a support, said bolt having a threaded head and a lug to be driven into I the support to secure said bolt against rotation, a washer carried by said bolt to be clamped between the head thereof and the support and to be secured against turning 1 V by said lug on said bolt and a contact nut to be threaded onto the head of said bolt and to be set against said washer.

5. A contact comprising a bolt to be secured to a support, said bolt having a threaded head and a lug to be driven into the support to secure said bolt against rotation, a washer carried by said bolt to be clamped between the head thereof and the support and to be secured against turning by said lug on said bolt and a contact nut to be threaded onto the head of said bolt and to be set against said washer, said Washer having a part to be engaged with aface of said nut to lock the latter against accidental turning.

In witness whereof, I have hereunto subscribed my name.

HARRY A. SEDGWIGK. 

